Hunter Death Grip???

So I was in an AV last night. I run TidyPlates and had "v" active. Anywho we waiting for the GY to cap at Drek.

I run up to the entrance and can see Drek, his 2 dogies, and 2 Tower Captains still standing and a green bar signifying a Hunter. Ok so theres only one Horde in there. I come around the corner to see about lighting him up.

He starts shooting me, and I start to cast a Lightning Bolt. Halfway through the cast, I'm yanked to his feet. Luckily someone had aggroed Drek on the other side so I got away. I was like wth?

About 20 secs later I peek around the corner (still mindful that my TidyPlates is still up and the ONLY PC I see is the Hunter). I peek around again and start to cast a Lava. Yanked to his feet again and this time Drek kills me. Hunter does an LOL emote.

So how did he do it? I have a 90 Hunter. I'm not aware of any Hunter Ability. I checked Petopia last night and don't notice any new pets. Is there a Trinket/Engineering I missed?